| Condenser is an important device in the ship, its performance is very important for the safety of the ship. The main failure model of condenser is the destruction of tube bundle, the tube bundle vibrate due to the flow force, beyond the limit damage occurs after; And vibration of tube bundle in condenser will transfer to the inner flow of the tube, cause pressure fluctuation of inner folw. Therefore, study of flow induced vibration properties of the condenser is very meaningful.This paper calculated the flow field around a short tube in three-dimensional, and compared with others' calculation and the experimental results, proved the accuracy of the LES model, and the correctness of the calculation parameters Settings.Through the calculation of a single tube model of condenser, got its vortex shedding condition in flow field and lift & drag force under the different flow speed. At the same time,used the Ansys Workbench software to calculate the coupled vibration of single tube, got the displacement and response frequency of single tube,the law between the fluid exciting force and tube displacement response frequency was analyzed.Take the single tube and inner flow for coupling calculation, under the different exciting force and different flow speed of inner flow, the effect of the vibration of single tube to inner flow , its frequency and the distribution law of inner flow was analyzed.At the end of this paper, the different lay ratio, order and staggered tube bundle was calculated under different flow speed, the distribution law of the vortex shedding and the force features of tubes were analyzed, verified the complexity of tube stress in the tube bundle,and different from the lift and drag characteristics of single tube. |
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